Games like Orc Assault

"Artificial Extinction" is a Sentry Defense game with Real Time Strategy elements, played from a First Person perspective. In the future, you play a colonist searching for a peaceful planet, only to find that the AI-driven terra-forming robots have turned hostile. With just 9 days to find a safe location, can you protect yourself and prepare for your family's arrival? The game tackles relevant topics such as AI development, LAWS, and military robotics.

"Silica" is a shooter/RTS hybrid offering 2-player co-op, PvP, and single-player action. Choose between human infantry or alien hive-mind, each with unique vehicles and creatures. Join the community through the official Discord server for updates, developer interaction, and player collaboration. Despite some bugs, the technical aspects, humor, and dense atmosphere make it a worthwhile experience.

"Age of Darkness: Final Stand" is a dark fantasy strategy game where players must lead their armies against an encroaching horde of nightmarish enemies. By constructing and upgrading buildings, recruiting units, and managing resources, players must hold out against the onslaught in a procedurally generated world. The game features a day-night cycle, strategic unit placement, and a unique "Necrostruct" mechanic that allows players to turn enemy structures into their own.

"Outpost: Infinity Siege" is a strategy game where players build their own outpost, gather resources, and explore different zones. The Vanguard Edition includes exclusive outpost components and a unique weapon with various attributes. Cooperative gameplay is also featured, allowing players to battle alongside others in various difficulty levels. Note: The above summary is based on the information provided in the game's description and is not an official summary.

"Lumencraft is a Role Playing game with great gameplay and stellar visuals, offering both single-player and local multi-player in a co-op, split screen setting. Explore procedurally generated levels, build your base, dig tunnels, and battle darkness to find the precious Lumen, Humanity's only hope for survival."

Volcanoids is a base-building shooter with a unique steampunk drillship base and open-world survival elements. Alone or with up to 3 players, explore a constantly changing volcanic island, battle hostile robots, and craft, upgrade, and automate your drillship. Despite its pretty visuals, humor, and exceptional gameplay, it suffers from being poorly optimized and requiring lots of grinding. The game features a good story and provides a full co-op and single-player experience.

"MarZ: Tactical Base Defense" is a strategy game that challenges you to build a defense base and fight off zombie hordes on Mars. The game features a 20-mission story campaign, skirmish mode with customizable waves of enemies, and an intense "Outbreak" mode. Utilize powerful terraforming tools to create custom maps and share them via Steam Workshop, and research new upgrades for your towers. Recently updated with increased technology options and reworked balancing.

"Taur is a single-player action-strategy sci-fi game with wonderful mechanics and fabulous visuals. Command the Prime Cannon, unlock and upgrade weapons and abilities, and build defenses to withstand different types of attacks. Every object in the environment is destructible, providing a tactically engaging experience, but beware of the heavy grinding."

"Sentry" is a Science Fiction Shooter game that offers various play options, including single-player, co-op for 2 players, and multi-player. As a member of the SENTRY Defense Program, your mission is to protect your vessel while it flees across space, using an arsenal of weapons, traps, and environmental destruction to fend off alien boarders. If your SENTRY falls in battle, another crew member will be thawed to continue the fight, ensuring that defeat only changes the strategic landscape aboard the ship. The game boasts beautiful gameplay and outstanding visuals.

Castle Craft is a game where players can build huge castles in an ancient wartorn world and must defend them against hordes of enemies in siege battles of epic proportions. Castle Craft is a unique blend of the voxel sandbox genre, action, and tower defense.